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Re: double-to-int conversion without a cast

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  Re: double-to-int conversion without a cast Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-02-25 07:54 -0500

#33880 — Re: double-to-int conversion without a cast

On 2/24/2016 8:07 PM, Stefan Ram wrote:
>    At a point in my course, I have only introduced basic
>    arithmetic operations and calls of static methods and
>    the types »int«, »double«, and »java.lang.String«.
>
>    I already can show them how to convert from int to double
>    (»* 1.0«) or between the numbers and »java.lang.String«
>    (calling conversion methods from the Java SE standard
>    library).
>
>    But I am not aware of how to convert from double to int
>    with only the above means. The standard library is large.
>    Maybe there is a static method that takes a double and returns
>    it's floor or rounded value as an int and I am not aware of it?
>
>    I don't need this. I just ask for curiosity.

     The Math.round() methods will do double to *long* or
*float* to int, but I don't know of a static double-to-int.

     But here's a *really* ugly idea:

	double d = ...;
	int i = new Double(d).intValue();

Personally, I think you should show the class the (int) operator,
telling them "I'll explain this in a later lesson; for now, just
use it as shown and don't ask questions."

-- 
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM

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